# What is the active region of a transistor?

Each junction of a transistor may be forward biased or reverse biased independently.These are following three different ways of biasing a transistor ,which is also known as modes of transistor operation. Forward active:- Emitter-Base junction is forward biased. Collector- base junction is reverse biased.

Similarly one may ask, what is the linear region?

Often we say “linear region” or “linear operation” in electronics when we mean in-between operation where a voltage is kept somehere between the power supply rails (as apposed to clamped to near one of them) or a device like a transistor is kept in the middle region where it is not fully on or fully off.

What is the cutoff region of a transistor?

Whenever we observe the terminals of a BJT and see that the emitter-base junction is not at least 0.6-0.7 volts, the transistor is in the cutoff region. In cutoff, the transistor appears as an open circuit between the collector and emitter terminals. As is seen in 2, this implies Vout is equal to 10 volts.

Are transistors linear?

If the input of a non-linear device such as a transistor only varies in a small range around a fixed value, then the input/output relation is linearized around this fixed value (usually called the quiescent point, Q-point, or Bias point). Non-linear elements will not follow Ohm’s law.

## Why VBE is 0.7 V?

For an unbiased transistor, considering only the BE junction which is a pn junction diode, 0.7V is the potential barrier. In an npn transistor base is positive(p) and emitter is negative(n). So the potential barrier vbe=0.7V. But in a pnp transistor the base is negative(n) and emitter is positive(p) so the vbe=-0.7V.

## What is the Q point of a transistor?

The operating point of a device, also known as bias point, quiescent point, or Q-point, is the steady-state voltage or current at a specified terminal of an active device (a transistor or vacuum tube) with no input signal applied.

## What do you mean by bipolar transistor?

A bipolar transistor is a semiconductor device commonly used for amplification. The device can amplify analog or digital signals. It can also switch DC or function as an oscillator. Physically, a bipolar transistor amplifies current, but it can be connected in circuits designed to amplify voltage or power.

## What is a saturation region?

Saturation is the on mode of a transistor. A transistor in saturation mode acts like a short circuit between collector and emitter. In saturation mode both of the “diodes” in the transistor are forward biased.

## What is active region in BJT?

Bipolar transistors have four distinct regions of operation, defined by BJT junction biases. Forward-active (or simply active) The base–emitter junction is forward biased and the base–collector junction is reverse biased.

## How do you know if a transistor is NPN or PNP?

Steps to identify the NPN type transistor:

• Keep the Multimeter in the Diode mode.
• Keep the positive probe to the center pin (Base) of the transistor.
• Touch the negative probe to the pin-1 (Emitter).
• Similarly touch the negative probe to the pin-3 (collector) with respect to the pin-2.
• ## How does transistor act as an amplifier?

Actually Transistor acts as only a variable resistor. The value of resistor between Collector and Emitter is changed by the base current. The Transistor acts as a Regulator (Variable Resistor) or a switch(ON/OFF). When a Transistor acts as a Regulator, it is called an Amplifier.

## What do you mean by biasing of a transistor?

Transistor Biasing is the process of setting a transistors DC operating voltage or current conditions to the correct level so that any AC input signal can be amplified correctly by the transistor.

## What is a transistor and how does it work?

A transistor is a miniature electronic component that can do two different jobs. It can work either as an amplifier or a switch: When it works as an amplifier, it takes in a tiny electric current at one end (an input current) and produces a much bigger electric current (an output current) at the other.

## What is the difference between NPN and PNP transistors?

The main difference between the NPN and PNP transistor is, an NPN transistor turns on when the current flows through the base of the transistor. In this type of transistor, the current flows from the collector (C) to the emitter (E). A PNP transistor turns ON, when there is no current at the base of the transistor.

## What is active state of transistor?

Each junction of a transistor may be forward biased or reverse biased independently.These are following three different ways of biasing a transistor ,which is also known as modes of transistor operation. Forward active:- Emitter-Base junction is forward biased. Collector- base junction is reverse biased.

## What is a DC load line?

The DC load line is the load line of the DC equivalent circuit, defined by reducing the reactive components to zero (replacing capacitors by open circuits and inductors by short circuits). It is used to determine the correct DC operating point, often called the Q point.

## What is the BJT?

Bipolar Junction Transistor (BJT) is a Semiconductor device constructed with three doped Semiconductor Regions (Base, Collector and Emitter) separated by two p-n Junctions, Figure 1. The p-n Junction between the Base and the Emitter has a Barrier Voltage (V0) of about 0.6 V, which is an important parameter of a BJT.

## What is a CE amplifier?

It is also named common- emitter amplifier because the emitter of the transistor is common to both the input circuit and output circuit. The input signal is applied across the ground and the base circuit of the transistor. The common- emitter circuit is the most widely used of junction, transistor amplifiers.

## What is the difference between BJT and FET?

BJTs and FETs are two different kinds of transistors and also known as active semiconductor devices. The major difference between BJT and FET is that, in a field effect transistor only majority charge carries flows, whereas in BJT both majority and minority charge carriers flows.

## What is the saturation of a transistor?

A transistor goes into saturation when both the base-emitter and base-collector junctions are forward biased, basically. So if the collector voltage drops below the base voltage, and the emitter voltage is below the base voltage, then the transistor is in saturation. Consider this Common Emitter Amplifier circuit.

## What is early effect in transistor?

The Early effect, named after its discoverer James M. Early, is the variation in the effective width of the base in a bipolar junction transistor (BJT) due to a variation in the applied base-to-collector voltage.

## Why the transistor is called a current controlled device?

A MOSFET is known as a voltage controlled device because a voltage applied to the gate controls the flow of current between the source and drain. For a BJT the principal is the same. It is a current controlled device because the base current controls the current flow from the emitter to collector.

## What is the meaning of cut off current?

In electronics, cut-off is a state of negligible conduction that is a property of several types of electronic components when a control parameter (that usually is a well-defined voltage or electric current, but could also be an incident light intensity or a magnetic field), is lowered or increased past a value (the

## What is the Q point of a BJT?

The operating point of a device, also known as bias point, quiescent point, or Q-point, is the point on the output characteristics that shows the DC collector–emitter voltage (Vce) and the collector current (Ic) with no input signal applied.

Originally posted 2022-03-31 05:39:04.

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